Osmotic Adjustment Associated with Variation in Bentgrass Tolerance to Drought Stress

By M. Dacosta, Bingru Huang. 2006

97 citations recorded by the source corpus.

Osmotic adjustment (OA) is a major physiological mechanism associated with maintenance of cell turgor in response to dehydration stress. The objectives of this study were to examine changes in capacity for OA in relation to plant tolerance to drought stress for two cool-season turfgrass species, creeping bentgrass (Agrostis stolonifera L.) and velvet bentgrass (A. canina L.), and to determine major solutes contributing to OA in these grass species. Plants of 'L-93' creeping bentgrass and 'Greenwich' velvet bentgrass were grown in a growth chamber in polyvinyl chloride (PVC) tubes (5 cm diameter, 40 cm high) fi lled with a 1:3 (v/v) sterilized mixture of sand and sandy loam soil. The experiment consisted of two soil moisture treatments: 1) well-watered control, irrigated three times per week to main- tain soil moisture near pot capacity; and 2) drought stress, irrigation completely withheld. Velvet bentgrass exhibited higher drought tolerance compared to creeping bentgrass, as manifested by higher visual turfgrass quality (TQ) and leaf relative water content (RWC) under drought stress. Both creeping bentgrass and velvet bentgrass exhibited OA in response to drought stress; however, velvet bentgrass exhibited 50% to 60% higher magnitude of OA, which could be related to the maintenance of higher leaf RWC and TQ for greater drought duration compared to creeping bentgrass. OA for both creeping bentgrass and velvet bentgrass was associated with accumulation of water soluble carbohydrates during the early period of drought and increases in proline content following prolonged period of drought; however, inorganic ion content (Ca 2+ and K + ) did not considerably change under drought stress and did not seem to contribute to OA in these species.

Subfields: Environmental Chemistry, Nature and Landscape Conservation, Plant Science

View Paper: https://www.semanticscholar.org/paper/2dab0ebd0a7eeec2619d69b731f445d8f0151ab8

How researchers see this paper

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In Environmental Chemistry

1. M. Dacosta
2. Yiwei Jiang
3. Bingru Huang
4. D. Karcher
5. M. Richardson
6. Shiwei Guo
7. Min Wang
8. Q. Shen

In Nature and Landscape Conservation

1. Yiwei Jiang
2. M. Dacosta
3. Bingru Huang
4. D. Karcher
5. M. Richardson
6. Shiwei Guo
7. Min Wang
8. Q. Shen

In Plant Science

1. M. Dacosta
2. Yiwei Jiang
3. Bingru Huang
4. Shiwei Guo
5. Q. Shen
6. Min Wang
7. Q. Zheng
8. M. Richardson

Citations in the corpus

• Research Advances in Mechanisms of Turfgrass Tolerance to Abiotic Stresses: From Physiology to Molecular Biology (2014, background): “, 2011), soluble sugars (mainly sucrose) (Jiang and Huang, 2001a; DaCosta and Huang, 2006), and potassium (Jiang and Huang, 2001a).”
• Drought Tolerance of Tall Fescue Populations Selected for High Root/Shoot Ratios and Summer Survival (2008, background): “Osmotic adjustment has been demonstrated in numerous grasses (DaCosta and Huang, 2006; Qian and Fry, 1997) and usually involves the accumulation of compatible solutes such as carbohydrates, amino acids, and mineral ions.”
• The Critical Role of Potassium in Plant Stress Response (2013, background): “Many studies have shown that osmotic adjustment of leaves is positively correlated with drought tolerance in various plant species [49].”